My first Japanese drama was : The glory of team Batista
I think it was Hakuba no Oujisama ~ Junai Tekireiki 
Mine was Koukou Kyoushi with Ueto Aya in 2003. ^^
Hana kimi OR Koizora one of these
Yamato Nadeshiko Shichi Henge, I watched it straight after the anime when i found out there was a live action of it :P
Mine was Limit (2013). I decided on New Years' Eve that I would start of 2014 with a Japanese drama, and I did. :P
I believe mine was Yamato Nadesico Shichi Henge, but I always watched way more Korean Drama. Love Hana Yori Dango though and just picked it up finally.
I think it was Kurosagi
My first drama was Gokusen. I had seen the anime on TV~ 
Mischievous Kiss: Love In Tokyo. And the only one so far >_<
hana yori dango !!!!